Portable tubular boiler



(No Model!) 2 Shets .-Sheet 1 G. SELDEN.

PORTABLE TUBULAR BOILER.

No. 479.991. Patented Aug. 2, 1892.

(No Model.) 2 Sheets-Sheet 2.

G. SELDEN.

PORTABLE TUBULAR BOILER. No. 479,991. Patented Aug. 2, 1892.

Prion.

FATENT GEORGE SELDEN, OF ERIE, PENNSYLVANIA.

PORTABLE TUBULAR BOILER.

SPECIFICATION forming part of Letters Patent No. 479,991, dated. August2, 1892.

Application filed January 7, 1892. Serial 1%. 417,302- (No model.

To all whom it may concern.-

Be it known that I, GEORGE SELDEN, a citizen of the United States, and aresident of Erie, county of Erie, and State of Pennsylvania, haveinvented a new and useful Improvement in Portable Tubular Boilers, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, making part of thisspecification.

My invention relates to that class of portable boilers employingfire-tubes extending from the fire-box through the boiler to a chamberin rear, through which connection is made with return-tubes passing backthrough the boiler to the smoke-box; and it consists in a novelconstruction and arrangement of the rear connecting-chamber referred tofor promoting combustion of the gases and other unconsumed products ofcombustion entering it, and thereby causing them to pass into andthrough the return-tubes at a greatly-increased temperature as comparedwith the ordinary construction of these chambers, and for facilitatingthe cleaning of the boiler, as hereinafter described and claimed.

In the accompanying drawings, Figure l is a perspective view of a boilerembracing my improvements. Fig. 2 is a plan of the rear end of theboiler, showing the rear tube-connecting chamber in section. Fig. 3represents a vertical section through the connectingchamber and rear endof the boiler; and Fig. '4 is a rear view of the boiler andconnectingchamber, the latter being shown partlyin section with one ofits doors removed.

The boiler in its organization or general arrangement of parts issimilar to that upon which Letters Patent were granted May 19, 1885, toWilliam Moran, No. 31S,128,with the fire-box constructed substantiallyas described in Letters Patent granted to me November 30, 1886, No.353,595, and need not therefore be described in detail further than isnecessary to an understanding of my present improvements.

A indicates the boiler, the forward end of which, extending over andbeyond the firepot, (indicated at 13,) is cylindrical in form, as shown,the rear portion in rear of the fire-pot being substantially ellipticalin form. The

lower tubes a (L extend through the lower part of the elliptical portionof the boiler from the fire-pot to a chamber 0 in rear of the boiler,and through which the products of combustion pass up to the upper orreturn tubes 1), which are preferably made smaller than the tubes (1, asshown, and which pass through the upper part of the elliptical portionof the boiler and through the cylindrical portion, terminating in thesmoke-box D, formed in the forwardly-projecting end of the boiler.

As thus far described, the arrangement of parts is similar to that ofthe patents referred to; but the chamber 0, instead of being formed bysheet-iron extensions of the sides, top, and bottom of the boiler, as insaid patents, is constructed as follows: E and E represent iron frames,preferably cast each in open rectangular form, with the sides of theframe made in concavo-convex form in cross-section, as

shown, to give them the required strength without unnecessary weight ofmaterial, facilitating their being bolted to the sides of the boiler andto a rear end frame F and to accommodate a fire-brick lining, ashereinafter described. These frames are secured one to each side of therear end of the boiler, forming an extension thereof, and at their rearends to the rear transverse frame F, which is of similar construction,except that it has an arched extension F, conforming to the archingupper portion of the boiler, to which it is connected by a sheet-ironcover f, bolted thereto, or an gle-iron clips f, bolted to the rear endof the boiler. The open side frames E and E are covered with sheet-ironplates or panels 6 e, and have their lower ends connected by ahorizontal plate e, which at its rear edge is bolted also to the frameF, which may, if desired, be cast in one piece with the side frames. Theopen frame F isclosed by means of doors G and G, hinged to the sides ofthe frames F, and which may be cast in the form of open rectangularframes provided with sheet-iron panels similar to the frames E and E,0rthey maybe cast with the panels in the form indicated in section in Fig.2, having flanges g and g on the sides, top, and bottom to accommodatethe fire-brick lining, as shown, and at the same time to give therequired strength to the casting without unnecessary weight of material.The opening at F in the arch of the frame F may be closed by asheet-iron panel like those in the frames E E, or the panel maybe casttherein,as in the doors G and G. The side frames and the doors G G thusconstructed have a lining of firebrick applied to them held in place ina manner similar to that of the fire-pot of my former patent referredto-that is to say, the bricks H have V-shaped notches formed in theirends, which at one side engage V-shaped projections h on the flanges ofthe frames and at intermediatepoints with upright througlrbolts h,rectangular in form in cross-section and set obliquely, as shown, toenter the V shaped notches in the adjacent ends of the bricks, and thusprevent accidental displacement of the bricks.

The rear wall of the boiler A, j ust above the return-flues b, has anL-shaped iron f bolted to and extending transversely across it, and uponthe horizontal ledge thereof and a horizontal flange on the uppertransverse bar f of the frame Fare placed a series of tongueand-grooveclfire-bricks H, which interlock and form a defiectingboard for turningthe products of combustion inward and causing them to pass through thereturn-fines. It will be observed thatthe bottom sheet 6 of thischamber, instead of conforming to the curve of the boiler, extendshorizontally across said end, leaving room below it for the hand-hole,(indicated at 1,) through which access is bad to the lower part of theboiler for cleaning it or for other purpose. By this arrangement accesscan be had to the boiler without opening the doors Grand getting at itthrough the chamber 0.

In the construction of the walls of the chamber C of thin iron, as inthe former patents referred to, much of the heat reaching said chamberwas lost through radiation, and the gases and other unconsu med prodnets of combustion were thereby so cooled as to be allowed to pass outthrough the return-tubes without being consumed, whereas by theconstruction described, the walls of the chamber with which the productsof combustion come in contact being thoroughly protected by the liningof fire-brick, radiation is to a large degree prevented and the bricks,becoming thoroughly heated, give to said chamber the character of acombustion-chamber, greatly assisting the process of combustion andcausing such products to pass into the return-fines at a much highertemperature, and consequently in a much more effective condition thanwhere the Walls are not protected as described. Like the fire-pot of myformer patent, referred to, the connecting combustion-chamber can bereadily and quickly removed, thereby facilit'ating handling andtransportation.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combustion-chamber for connecting the direct and return tubes ofthe tubular boiler, made removable and composed of east side and rearconnecting-frames and doors paneled and brick-lined, substantially asdescribed.

2. The combination, with a portable tubular boiler made cylindrical inform over the fire-pot and elliptical in form in rear thereof andprovided in said rear elliptical portion with direct fines and over thelatter with return-tubes and with a hand-hole for giving access to saidfines, of a removable brick-lined combustion-chamber located above saidhandhole and connecting the direct and return tubes, substantially asdescribed.

In testimony whereof I have hereunto set my hand this 2d day of January,A. D. 1892.

GEORGE SELDEN. Witnesses:

EDWARD. P. SELDEN, A. P. MOFFETT.

